Do i need ilda for the Fb3

Hi there,
I have a FB3 SE (without DMX) and I've noticed that there's a mini USB port on the board as well as ilda.
i understand the ilda (in) & USB are to be mounted in the back of the projector but as far as the usb connection is concerned, is this what i would use to connect to the PC. If so, what's the ilda connector for?
Many thanks
Adrian